The role of interfaces in CoFe/IrMn exchange biased systems

A trilayer system consisting of an IrMn layer exchanged coupled to two CoFe layers of equal thickness has been studied. A single stage reversal was observed over a wide range of temperatures. Two bilayers with the same thicknesses of the pinning layer but different ferromagnetic thicknesses were also studied. By comparing the magnetic properties of these three stacks the effect of the interfacial area on the exchange field and the coercivity has been determined. We find that the interfacial area has a very minor effect on the exchange field H-ex and the blocking temperature (T-B) but causes a doubling of the coercivity (H-c). This indicates that H-c is dominated by the interface whereas the exchange bias is controlled by volumetric effects

Animal bones from Anglo-Scandinavian York

INTRODUCTION: This chapter provides an overview of the current state of knowledge regarding vertebrate animals in and around York in the Anglo-Scandinavian period. The great majority of the available evidence derives from 16-22 Coppergate (AY 15/3), with smaller amounts of data from a number of excavations around the city. The aim is not to describe the data at length, but to review the information inferred from those data under several thematic headings. Examination of the material from Coppergate began as the excavation neared its end, early in the 1980s. At that time, our knowledge of urban zooarchaeology in Britain rested on just a few major studies (e.g. Exeter, Maltby 1979; Southampton, Bourdillon and Coy 1980; Baynards Castle, London, Armitage 1977), and little or nothing was known about Anglo-Scandinavian husbandry. The intervening 30 years has seen the publication of many substantial assemblages from 8th- to 15th century urban contexts across northern Europe (e.g. Birka, Ericson et al. 1988; Ribe, Hatting 1991; Waterford, McCormick 1997; Lubeck, Rheingans and Reichstein 1991; Compiegne, Yvinec 1997). With that increasing information has come some shift in emphasis from data such as the relative abundance of different taxa and changes through time, to more thematic questions of supply and demand, and the value of animal bones in discussions on the emergence of towns and their associated social structures (e.g. Bourdillon 1984; O'Connor 1994; Crabtree 1990). This review therefore revisits previously published material, and incorporates additional data in a synthesis of evidence from York as a whole, and in regional comparisons. Practical methods are not discussed at length here: they are detailed by site in the appropriate fascicules of AY 15/1-5, and reviewed in AY 19/2

An invitation to grieve: reconsidering critical incident responses by support teams in the school setting

This paper proposes that consideration could be given to an invitational intervention rather than an expectational intervention when support personnel respond to a critical incident in schools. Intuitively many practitioners know that it is necessary for guidance/counselling personnel to intervene in schools in and following times of trauma. Most educational authorities in Australia have mandated the formulation of a critical incident intervention plan. This paper defines the term critical incident and then outlines current intervention processes, discussing the efficacy of debriefing interventions. Recent literature suggests that even though it is accepted that a planned intervention is necessary, there is scant evidence as to the effectiveness of debriefing interventions in stemming later symptoms of post traumatic stress disorder. The authors of this paper advocate for an expressive therapy intervention that is invitational rather than expectational, arguing that not all people respond to trauma in the same way and to expect that they will need to recall and retell what has happened is most likely a dangerous assumption. A model of invitation using Howard Gardner’s (1983) multiple intelligences is proposed so that students are invited to grieve and understand emotionally what is happening to them following a critical incident

Bones as evidence of meat production and distribution in York

[First Paragraphs] Many books and papers have been written on the general principles and minutiae of using the animal bones recovered from archaeological deposits as a source of information on past diet.A full discussion of methodological issues is beyond the remit of this chapter, but it is worth reminding ourselves that there are many stages between an animal being killed and used for food, and a pile of bones arriving on the bench. There is the initial stage of decision-making on the part of the human population, and of individuals within it, and possibly on the part of the animals as well. Those decisions bring people and animaIs together ar the point of the animals' death, and may well be what we are seeking to infer from the archaeological record. After slaughter, animals of any size will be butchered in various ways, and parts of one carcass may be traded or redistributed to several locations, at each of which different people will take further decisions as to recipe and utilization. Some bones will have been separared from the carcass during initial butchering, and will be disposed of fairly immediately. After consumption (and different individuals will have different ideas as to what is worth eating), the remaining bones and other waste might be used in some orher way (soup, glue, toothpicks), before being destroyed or deposited in some dump or refuse pit. Micro-organisms and geochemical agents then set to work, modifying and destroying some or all bone fragments through the centuries, until a residue reaches a tenuous equilibrium with the sediment around it, and survives until the archaeologists arrive on site

Skin and bones: correlating the osteological and artefactual evidence

The aim of this text is to review the osteological evidence from Anglo-Scandinavian and medieval York for the retrieval and working of skins and hides, and to cross-correlate that evidence with the data obtained from studies of leather artefacts. Although much of the animal bone debris from excavations in York appears to have derived from the butchering of animals for meat, and from their domestic consumption, some evidence of the retrieval of useful body parts, such as hides and horns, might be apparent. The text begins by discussing the nature of such evidence, and then reviews the available data

The social cognition of medical knowledge, with special reference to childhood epilepsy

This paper arose out of an engagement in medical communication courses at a Gulf university. It deploys a theoretical framework derived from a (critical) sociocognitive approach to discourse analysis in order to investigate three aspects of medical discourse relating to childhood epilepsy: the cognitive processes that are entailed in relating different types of medical knowledge to their communicative context; the types of medical knowledge that are constituted in the three different text types analysed; and the relationship between these different types of medical knowledge and the discursive features of each text type. The paper argues that there is a cognitive dimension to the human experience of understanding and talking about one specialized from of medical knowledge. It recommends that texts be studied in medical communication courses not just in terms of their discrete formal features but also critically, in terms of the knowledge which they produce, transmit and reproduce